OFFSET
0,1
LINKS
G. C. Greubel, Table of n, a(n) for n = 0..200
EXAMPLE
-2x/3 +4x^3/81 -136x^5/25515 +656x^7/688905-...
MATHEMATICA
Numerator[Take[CoefficientList[Series[Sin[Cot[x] - Coth[x]], {x, 0, 26}], x], {2, -1, 2}]] (* G. C. Greubel, Nov 13 2016 *)
CROSSREFS
KEYWORD
sign,frac
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
EXTENSIONS
Name edited by R. J. Mathar, Dec 21 2011
STATUS
approved